POPULATION PERFORMANCE AND GENETIC PARAMETERS OF SOME PROMISING PEA LINES

15 RESEARCH REPORTS PNL Volume 11 1979

Kaul, M. L. H. and R. Garg University of Kurukshetra, India

After X-irradiation of 'Bonneville¹, many high protein mutants were

isolated in the M3 generation (1). But these were very tall, late, and low

yielding and with small, shrivelled, and deformed seeds. These mutants were

intercrossed among themselves, back-crossed to the parental line, and crossed

with other high yielding mutants. Recombinants with high grain yield, better

seed protein content, and less shoot height were selected in F3 and selfed

for 4 generations. Their performance was evaluated by growing them in a

randomized block design with 4 replications per genotype. The protein values

recorded are the lowest values obtained for the genotypes 1-14. But for the

local line the values recorded are the average of 30 plants per season grown

for 4 successive generations. Genotype No. 2 has been included because of

its earliness. The average performance of the selected lines (Table 1) indi-

cates that the lines 14, 13, 3, 5, and 6 are promising (in order of their

superiority) and are better than the commonly cultivated local line in this

region. Moreover, except for line 13, these lines are not tall, and their

breeding value is thus very high.

The analysis of variance (F value, Table 2) reveals a highly significant

variance in each phenotypic trait among the genotypes. Nevertheless, internode

length appears to be of environmental origin. A high genotypic variance for

the shoot height and seed number points to the possibility of a successful

selection of short statured, high yielding plants among these genotypes.

Furthermore, the genotypic coefficient of variation, indicating the extent

of observed variation due to genetic factors, was high for seed yield and

seeds per plant (Table 2). Nevertheless, the heritability values were very

high for shoot height, nodes and seeds per plant, and seed yield. However,

while heritability estimates are subject to genotype environment interaction,

genetic advance expressed as the percentage of mean was highest for the traits

seeds per plant and total seed yield and lowest for shoot height and nodes ]

per plant.

Thus, the traits seed yield and seeds per plant showed a high genetic

coefficient of variation, heritability, and expected genetic advance, and

they are highly and positively intercorrelated (Y=2.59 + 0.16X, r=0.73,

P< 0.01). These results are encouraging from the standpoint of practical

breeding and selection.

(1) Kaul, M. L. H. 1977. Proc. 3rd Sabroa Congress (Australia). 3c:36-41.



	15 RESEARCH REPORTS PNL Volume 11 1979 POPULATION PERFORMANCE AND GENETIC PARAMETERS OF SOME PROMISING PEA LINES

	Kaul, M. L. H. and R. Garg University of Kurukshetra, India After X-irradiation of 'Bonneville¹, many high protein mutants were isolated in the M3 generation (1). But these were very tall, late, and low yielding and with small, shrivelled, and deformed seeds. These mutants were intercrossed among themselves, back-crossed to the parental line, and crossed with other high yielding mutants. Recombinants with high grain yield, better seed protein content, and less shoot height were selected in F3 and selfed for 4 generations. Their performance was evaluated by growing them in a randomized block design with 4 replications per genotype. The protein values recorded are the lowest values obtained for the genotypes 1-14. But for the local line the values recorded are the average of 30 plants per season grown for 4 successive generations. Genotype No. 2 has been included because of its earliness. The average performance of the selected lines (Table 1) indi- cates that the lines 14, 13, 3, 5, and 6 are promising (in order of their superiority) and are better than the commonly cultivated local line in this region. Moreover, except for line 13, these lines are not tall, and their breeding value is thus very high. The analysis of variance (F value, Table 2) reveals a highly significant variance in each phenotypic trait among the genotypes. Nevertheless, internode length appears to be of environmental origin. A high genotypic variance for the shoot height and seed number points to the possibility of a successful selection of short statured, high yielding plants among these genotypes. Furthermore, the genotypic coefficient of variation, indicating the extent of observed variation due to genetic factors, was high for seed yield and seeds per plant (Table 2). Nevertheless, the heritability values were very high for shoot height, nodes and seeds per plant, and seed yield. However, while heritability estimates are subject to genotype environment interaction, genetic advance expressed as the percentage of mean was highest for the traits seeds per plant and total seed yield and lowest for shoot height and nodes ] per plant. Thus, the traits seed yield and seeds per plant showed a high genetic coefficient of variation, heritability, and expected genetic advance, and they are highly and positively intercorrelated (Y=2.59 + 0.16X, r=0.73, P< 0.01). These results are encouraging from the standpoint of practical breeding and selection.

	(1) Kaul, M. L. H. 1977. Proc. 3rd Sabroa Congress (Australia). 3c:36-41.